CN216351538U

CN216351538U - Optical system of virtual reality display equipment and virtual reality display equipment

Info

Publication number: CN216351538U
Application number: CN202121889167.XU
Authority: CN
Inventors: 王小根
Original assignee: Guangzhou Shixiang Technology Co Ltd
Current assignee: Guangzhou Shixiang Technology Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2022-04-19
Anticipated expiration: 2031-08-12

Abstract

The utility model provides an optical system of a virtual reality display device, comprising: an image display unit, a first lens group, and a second lens group arranged in order; the first lens group refracts the image light emitted by the display unit and transmits the image light to the second lens group; the second lens group comprises a first polarizing device, a first lens, a semi-transmitting and semi-reflecting device, a second lens and a second polarizing device which are sequentially arranged along the emitting direction of the image light; the image light rays are emitted by the image display unit and then sequentially pass through the first lens group and the second lens group. Compared with the prior art, the optical system provided by the utility model adjusts light rays by using a polarization principle, simultaneously refracts the light rays by using the same lens for multiple times in a refraction and reflection mode, provides proper focal power, and further provides a clear image.

Description

Optical system of virtual reality display equipment and virtual reality display equipment

Technical Field

The utility model relates to the technical field of virtual reality, in particular to an optical system of virtual reality display equipment and the virtual reality display equipment.

Background

The optical system refers to a system formed by combining various optical elements such as a lens, a reflector, a prism and a diaphragm in a certain order, and is generally used for imaging or optical information processing, for example, imaging of a virtual reality device.

The existing zoom optical system for virtual reality devices is usually implemented by combining a plurality of lenses, and the volume of the device is larger if the light is modulated due to the larger volume of the combination of the lenses.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to overcome the disadvantages and drawbacks of the prior art and to provide an optical system of a virtual reality display apparatus and a virtual reality display apparatus.

An embodiment of the present invention provides an optical system of a virtual reality display apparatus, including: an image display unit, a first lens group, and a second lens group arranged in order; the first lens group refracts the image light emitted by the image display unit and transmits the image light to the second lens group; the second lens group comprises a first polarizing device, a first lens, a semi-transmitting and semi-reflecting device, a second lens and a second polarizing device which are sequentially arranged along the emitting direction of the image light;

the image light rays are emitted by the image display unit and then sequentially pass through the first lens group and the second lens group;

when the image light passes through the second lens group, the image light is transmitted and converted into a first polarized light beam through the first polarizing device in sequence; the first polarized light beam is transmitted through the first lens, partially transmitted through the semi-transparent and semi-reflective device, transmitted through the second lens, reflected by the second polarizing device and transformed into a second polarized light beam; the second polarized light beam is transmitted through the second lens in sequence, is partially reflected by the semi-transmitting and semi-reflecting device, and is emitted out through the second polarizing device after being transmitted through the second lens.

Compared with the prior art, the optical system provided by the utility model adjusts the light by using the polarization principle, and simultaneously refracts the light by using the same lens for multiple times in a refraction and reflection mode to provide proper focal power, so that a clear image is provided.

Another embodiment of the present invention provides a virtual reality display apparatus, including: the equipment body, set up and be in picture frame on the equipment body and two optical system as above-mentioned virtual reality display device, virtual reality display device's optical system is in the picture frame.

In order that the utility model may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of an optical system of a head-mounted display device according to an embodiment of the present invention;

fig. 2 is an optical path diagram of an optical system of a head-mounted display apparatus according to another embodiment of the present invention.

Description of reference numerals:

10. an image display unit; 20. a first lens group; 21. a first mounting sleeve; 22. a second mounting sleeve; 23. a third lens; 24. a fourth lens; 25. a fifth lens; 31. a first polarizing means; 32. a first lens; 33. a semi-transmitting and semi-reflecting device; 34. a second lens; 35. a second polarizing means.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Please refer to fig. 1, which is a schematic structural diagram of an optical system of a head-mounted display device according to an embodiment of the present invention, the optical system of the head-mounted display device includes: an image display unit 10, a first lens group 20, and a second lens group arranged in this order; the first lens group 20 refracts the image light emitted by the image display unit 10 and transmits the image light to the second lens group for zooming the image light; the second lens group includes a first polarizing device 31, a first lens 32, a transflective device 33, a second lens 34, and a second polarizing device 35, which are sequentially arranged in an image light emitting direction.

Referring to fig. 2, which is an optical path diagram of an optical system of a head-mounted display device according to another embodiment of the present invention, an image light emitted by the image display unit 10 sequentially passes through the first lens group 20 and the second lens group, and when passing through the second lens group, the image light sequentially passes through the first polarizer 31 to be transmitted and converted into a first polarized light beam; the first polarized light beam is transmitted through the first lens 32, partially transmitted through the transflective device 33, transmitted through the second lens 34, reflected by the second polarizing device 35 and transformed into a second polarized light beam; the second polarized light beam is transmitted through the second lens 34 in sequence, partially reflected by the transflective device 33, transmitted through the second lens 34, emitted through the second polarizing device 35, and finally enters human eyes.

In some alternative embodiments, the second lens 34 is used to refract the second polarized light beam into parallel light, and it should be noted that divergent light emitted from one point of the image display device becomes parallel light beam after passing through the first lens group 20 and the second lens group, and divergent light emitted from different points of the image display device will converge at different positions after passing through the first lens group 20 and the second lens group.

In some optional embodiments, the light incident surface of the first lens element 32 along the image light emitting direction is a plane, and the light emergent surface along the image light emitting direction is a concave surface; the light incident surface of the second lens 34 along the image light emitting direction is a convex surface matched with the concave surface, and the light emergent surface along the image light emitting direction is a plane; the first polarizer 31, the first lens 32, the transflective device 33, the second lens 34, and the second polarizer 35 are sequentially attached to each other.

In some alternative embodiments, the first lens 32, the transflective device 33 and the second lens 34 are sequentially cemented to form a cemented lens; in this case, the transflective device 33 is preferably a transflective film.

In some alternative embodiments, the first polarizer 31 is configured to transform the image light into the first polarized light beam with a first rotation direction in a transmission mode, and the second polarizer 35 is configured to transform the first polarized light beam into the second polarized light beam with a second rotation direction in a reflection mode; the first polarized light beam and the second polarized light beam are light beams in a circular polarization state or an elliptical polarization state, and the first deflection rotating direction and the second deflection rotating direction are opposite. In addition, when the second polarized light beam passes through the second polarizer 35 again, the light beam transmitted by the second polarizer 35 is converted into a linearly polarized light beam, and then enters the human eye for imaging. In the present embodiment, the first polarized light beam is right-handed circularly polarized light, the second polarized light beam is left-handed circularly polarized light, and after the image light passes through the first polarizer 31, the light energy is lost by 50%, and the light becomes right-handed circularly polarized light; after the first polarized light beam passes through the semi-reflecting and semi-transmitting device, the light energy of the first polarized light beam is lost by 50 percent again; when the right-handed circularly polarized light is reflected by the second polarizing device 35, the right-handed circularly polarized light is changed into left-handed circularly polarized light, and then the left-handed circularly polarized light is reflected by the semi-reflecting and semi-transmitting device, and the light energy is lost by 50 percent; finally, the left-handed circularly polarized light passes through the second polarizing device 35 and is converted into a light beam in a linear polarization state, and the light beam enters human eyes for imaging; therefore, in this embodiment, the light efficiency of the entire optical system is 12.5%.

In some alternative embodiments, the first polarizer 31 includes an absorption polarizer and a first quarter-wave plate sequentially arranged along the emission direction of the image light, and the absorption polarizer can reduce stray light. Of course, the polarizer of the first polarizer 31 may not be an absorbing polarizer.

In some alternative embodiments, the second polarizer 35 includes a second quarter-wave plate and a reflective polarizer sequentially arranged along the image light emitting direction, wherein the reflective polarizer can reflect the first polarized light beam and transmit the second polarized light beam.

In some optional embodiments, the optical system further comprises an adjusting mechanism, the adjusting mechanism comprises a first mounting sleeve 21 and a second mounting sleeve 22 extending along the image light emitting direction, and the first mounting sleeve 21 and the second mounting sleeve 22 are movably sleeved and can relatively move along the image light emitting direction; the image display unit 10 is arranged in the first mounting sleeve 21; the first lens group 20 includes a third lens 23, a fourth lens 24 and a fifth lens 25 arranged in this order along the image light emitting direction, the third lens 23 and the fourth lens 24 are disposed in the first mounting sleeve 21, and the fifth lens 25 is disposed in the second mounting sleeve 22; the second lens group is disposed within the second mounting sleeve 22. It should be noted that, the first lens group 20 may have a suitable structure according to actual needs, and the distance between the two lenses may be adjusted to achieve zooming; it is also possible to use only one lens, and adjust the position of the lens between the image display unit 10 and the second lens group to achieve zooming, without limitation.

In addition, it should be noted that, the adjusting mechanism may be selected according to actual requirements, for example, the image display unit 10, the third lens 23 and the fourth lens 24 are fixedly disposed on a fixed base, a guide is disposed on the fixed base, the fifth lens 25 and the second lens group are disposed on the guide and move along the guide, and the distance between the fifth lens 25 and the third lens 23 and the fourth lens 24 may be changed, but is not limited to this example.

In order to improve the image clarity, in some alternative embodiments, at least one of the light emitting surface and the light incident surface of the third lens 23 along the image light emitting direction, the light emitting surface and the light incident surface of the fourth lens 24 along the image light emitting direction, and the light emitting surface and the light incident surface of the fifth lens 25 along the image light emitting direction is aspheric.

The above-mentioned optical system of virtual reality display device can use on the virtual reality display device, this virtual reality display device includes: the equipment body, set up and be in picture frame on the equipment body and two optical system as above-mentioned virtual reality display device, virtual reality display device's optical system is in the picture frame.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An optical system of a virtual reality display device, comprising: an image display unit, a first lens group, and a second lens group arranged in order; the first lens group refracts the image light emitted by the image display unit and transmits the image light to the second lens group; the second lens group comprises a first polarizing device, a first lens, a semi-transmitting and semi-reflecting device, a second lens and a second polarizing device which are sequentially arranged along the emitting direction of the image light;

2. The optical system of a virtual reality display device of claim 1, wherein: the second lens is used for refracting the second polarized light beam into parallel light.

3. The optical system of a virtual reality display device according to claim 2, wherein: the light incident surface of the first lens along the image light emitting direction is a plane, and the light emergent surface along the image light emitting direction is a concave surface;

the light incident surface of the second lens along the image light emitting direction is a convex surface matched with the concave surface, and the light emergent surface along the image light emitting direction is a plane;

the first polarizing device, the first lens, the semi-transmitting and semi-reflecting device, the second lens and the second polarizing device are sequentially attached and installed.

4. The optical system of a virtual reality display device of claim 3, wherein: the first lens, the semi-transparent and semi-reflective device and the second lens are sequentially glued to form a cemented lens.

5. The optical system of a virtual reality display device of claim 1, wherein: said first polarizing means for transilluminating said image light into said first polarized light beam having a first direction of rotation, said second polarizing means for reflectively illuminating said first polarized light beam into said second polarized light beam having a second direction of rotation;

the first polarized light beam and the second polarized light beam are light beams in a circular polarization state or an elliptical polarization state, and the first deflection rotating direction and the second deflection rotating direction are opposite.

6. The optical system of a virtual reality display apparatus according to any one of claims 1 to 5, wherein: the first polarizing device comprises an absorption polarizer and a first quarter-wave plate which are sequentially arranged along the emitting direction of the image light.

7. The optical system of a virtual reality display apparatus according to any one of claims 1 to 5, wherein: the second polarizing means includes a second quarter-wave plate and a reflective polarizer arranged in this order along the image light emitting direction.

8. The optical system of a virtual reality display apparatus according to any one of claims 1 to 5, wherein: the optical system further comprises an adjusting mechanism, the adjusting mechanism comprises a first mounting sleeve and a second mounting sleeve which extend along the image light emitting direction, and the first mounting sleeve and the second mounting sleeve are movably sleeved and can relatively move along the image light emitting direction;

the image display unit is arranged in the first mounting sleeve;

the first lens group comprises a third lens, a fourth lens and a fifth lens which are sequentially arranged along the image light emitting direction, the third lens and the fourth lens are arranged in the first mounting sleeve, and the fifth lens is arranged in the second mounting sleeve;

the second lens group is disposed within the second mounting sleeve.

9. The optical system of a virtual reality display device of claim 8, wherein: at least one of the light emitting surface and the light incident surface of the third lens along the image light emitting direction, the light emitting surface and the light incident surface of the fourth lens along the image light emitting direction, and the light emitting surface and the light incident surface of the fifth lens along the image light emitting direction is an aspheric surface.

10. A virtual reality display device, comprising: an apparatus body, a frame provided on the apparatus body, and two optical systems of the virtual reality display apparatus according to any one of claims 1 to 9, the optical systems of the virtual reality display apparatus being within the frame.